CVE-2019-18886

mediumpriority · track · 22EPSS 0.016 · 75 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.55% (75th) EPSS

CVSS 5 · medium

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-203USprimaryCWE-200USCWE-203US

affected products (7)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
sensiolabs symfony4.2.0 → 4.2.11nvdUScpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
sensiolabs symfony4.3.0 → 4.3.7nvdUScpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
Packagist symfony/security-http4.1.0 → 4.2.12osvUSpkg:composer/symfony/security-http
Packagist symfony/security-http4.3.0 → 4.3.8osvUSpkg:composer/symfony/security-http
Packagist symfony/symfony4.1.0 → 4.2.12osvUSpkg:composer/symfony/symfony
Packagist symfony/symfony4.3.0 → 4.3.8osvUSpkg:composer/symfony/symfony

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-4vpc-5jx4-cfqgUser enumeration leak using switch user functionality in Symfony2019-12-02ghsa · osvUS
An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2019-11-21modified 2026-06-17

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+881 more

references (13)

External citations — patches, advisories, analysis.

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